The Screw,close Tolerance, cataloged under National Stock Number 5305-01-511-9645, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 19 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-511-9645 |
| Primary Part Number | TX1026C4-3AF |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Head Height | 0.060 INCHES NOMINAL IN |
| Fastener Length | 0.612 INCHES NOMINAL IN |
| Thread Length | 0.425 INCHES NOMINAL IN |
| Criticality Code Justification | AGAV |
| Material Document and Classification | AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.187 INCHES NOMINAL IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Internal Drive Style | CROSS RECESS TYPE IA |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.358 INCHES MINIMUM AND 0.365 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| TX1026C4-3AF PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| 3M1170C4-3AF PRIMARY | The Boeing Company Div Defense (USA) |
| TX1027C4-3AF | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| 3M1170C4-3AF PRIMARY | Saturn Fasteners Inc (USA) |
| 3M1170C4-3AF PRIMARY | Heartland Precision Fasteners Inc (USA) |
| 3M1170C4-3AF PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 11825C4-3AF | Reid Products Inc. Dba Reid Products Inc (USA) |
| GS1014C4-3AF PRIMARY | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| TX1027C4-3AF PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 3M1170C4-3AF PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 11845C4-3AF PRIMARY | Reid Products Inc. Dba Reid Products Inc (USA) |
| TX1027C4-3AF PRIMARY | Huck International, Inc (USA) |
| TX1027C4-3AF PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| TX1027C4-3AF PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3M1170C4-3AF | Houston Precision Fasteners I Lp (USA) |
| TX1027C4-3AF | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| TX1027C4-3AF | Howmet Global Fastening Systems Inc (USA) |
| WC1170C4-3AF | West Coast Aerospace, Inc. (USA) |
| TX1027C4-3AF PRIMARY | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| TX1027C4-3AF | 3/2 Design control — primary reference U.S. Government activity |
| TX1027C4-3AF | 5/9 Secondary reference Sps Technologies Inc |
| TX1027C4-3AF | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-511-9645 is a Screw,close Tolerance, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-511-9645 has 19 manufacturer part numbers on file: TX1026C4-3AF (Howmet Global Fastening Systems Inc), 3M1170C4-3AF (The Boeing Company Div Defense), TX1027C4-3AF (Fairchild Fasteners Europe - Vsd Gmbh), 3M1170C4-3AF (Saturn Fasteners Inc), 3M1170C4-3AF (Heartland Precision Fasteners Inc) and 14 more.
Key specifications for TX1026C4-3AF: Head Height: 0.060 INCHES NOMINAL IN; Fastener Length: 0.612 INCHES NOMINAL IN; Thread Length: 0.425 INCHES NOMINAL IN; Criticality Code Justification: AGAV. 17 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.